Think about the timing. The models were not kept at Paramount. Excelsior was sitting at ILM when not being used. I'm not sure where the Movie Refit was stored, but they film the episode (Peak Performance) intending to use a Constitution Class ship and then for some reason they don't? Was it just because they didn't want to film the 1701-A or was it because they couldn't film the 1701-A like they planned and needed another ship? At that point they had the Stargazer model so it would be equally easy to change the registry on either one. They are just decals, but if they were told no on the 1701-A, they would have to change plans and use the Stargazer model. It fits logically which is why I tend to believe it. I've learned a lot about the models when they were not in use that makes a lot of sense about why they kept going back to the old standards. I'm not sure why the Constellation or Ambassador classes were not used more once they had the models. Probably because so much could be done with stock footage of the other three models (Excelsior, Miranda, and Oberth).
Anyway, I know better than to get into an argument with our dear Dukhat. He has some great information, but nothing posted so far has proven that the 1701-A was unavailable for filming is not accurate. Although that could also be because of the various incidents that that model went through between films and after TUC. It wasn't often in any shape to be filmed unless it was full restored, which would have been outside the TV budget. Between TVH and TFF it was half painted gray. Between TFF and TUC it was partially painted white and the wiring harness was cut. After TUC it went to the Smithsonian and was on display with the TOS Enterprise (and both Klingon Battlecruisers and the TOS shuttlecraft). So it may not be because they wouldn't allow it, but it was in no shape to be filmed or unavailable for filming. It was loaned out for some strange reasons and my understanding is that it was supposed to be returned intact and was not. So the exact situation is not certain, but it is certain that for all the times TNG intended to use it, they never did. And from the dates, Peak Performance was likely victim of the model being occupied at the FX house for TFF (or not yet returned). So I think the TNG production truly intended to use it, but they weren't able to and found another solution. It is too bad they didn't refit the Star Trek III burned up 1701 for filming. It probably would have been fairly easy and given a good enough model for Television.
Anyway, I know better than to get into an argument with our dear Dukhat. He has some great information, but nothing posted so far has proven that the 1701-A was unavailable for filming is not accurate. Although that could also be because of the various incidents that that model went through between films and after TUC. It wasn't often in any shape to be filmed unless it was full restored, which would have been outside the TV budget. Between TVH and TFF it was half painted gray. Between TFF and TUC it was partially painted white and the wiring harness was cut. After TUC it went to the Smithsonian and was on display with the TOS Enterprise (and both Klingon Battlecruisers and the TOS shuttlecraft). So it may not be because they wouldn't allow it, but it was in no shape to be filmed or unavailable for filming. It was loaned out for some strange reasons and my understanding is that it was supposed to be returned intact and was not. So the exact situation is not certain, but it is certain that for all the times TNG intended to use it, they never did. And from the dates, Peak Performance was likely victim of the model being occupied at the FX house for TFF (or not yet returned). So I think the TNG production truly intended to use it, but they weren't able to and found another solution. It is too bad they didn't refit the Star Trek III burned up 1701 for filming. It probably would have been fairly easy and given a good enough model for Television.